Abstract The lack of high efficient, predictable, and reliable power take-off (PTO) systems limits developments of ocean wave energy technology. In this paper, a two-body self-reacting wave energy converter (WEC) with a novel PTO is designed, modelled and implemented for efficiency enhancement. A novel mechanical motion rectifier (MMR) using a ball screw mechanism and an enclosed gear set is integrated to improve the energy harvesting efficiency and reliability by rectifying the oscillatory wave motion into unidirectional rotation of the generator. Detailed design and dynamic modelling for the proposed WEC are presented. A prototype of the PTO is tested in a dry lab to characterize and refine the dynamic modelling. The characterized PTO model is combined with the WEC model to create an overall system model. A water tank test is conducted to verify the overall system dynamics, which proves the accuracy of the model and shows the advantages of the proposed WEC on efficiency and predictability. Following the method of how the WEC system is characterized, performance prediction of the proposed WEC with MMR PTO can be achieved with high accuracy.

中文翻译：

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具有新型取力器的二体波浪能转换器的表征与验证

摘要 缺乏高效、可预测和可靠的动力输出（PTO）系统限制了海浪能技术的发展。在本文中，设计、建模和实现了一种具有新型 PTO 的二体自反应波浪能转换器 (WEC) 以提高效率。使用滚珠丝杠机构和封闭齿轮组的新型机械运动整流器 (MMR) 集成在一起，通过将振荡波动整流为发电机的单向旋转来提高能量收集效率和可靠性。提出了所提议的 WEC 的详细设计和动态建模。PTO 的原型在干燥实验室中进行测试，以表征和改进动态建模。特征化的 PTO 模型与 WEC 模型相结合，创建一个整体系统模型。进行了水箱测试以验证整体系统动力学，这证明了模型的准确性，并显示了所提出的 WEC 在效率和可预测性方面的优势。遵循 WEC 系统如何表征的方法，可以高精度地实现对所提出的具有 MMR PTO 的 WEC 的性能预测。